Presentation on theme: "MH SBI 4U (DNA) Deoxyribonucleic acid DNA is thought of as a “recipe for life” DNA is the nucleic acid that contains the genetic instructions that bring."— Presentation transcript:
(DNA) Deoxyribonucleic acid DNA is thought of as a “recipe for life” DNA is the nucleic acid that contains the genetic instructions that bring us to life Found in the nucleus of every cell in the human body Four bases: A, T, C, G Our DNA is 99.9% identical 0.1 % is different, 3 million base pairs
Dr. Alec Jeffreys Dr. Jeffreys discovered the use of DNA in forensics Fingerprinting was the first method of evidence Searched for a more accurate method DNA in forensic criminology is the use of DNA to match a criminal to a crime scene Which was powerful enough to implicate or eliminate a suspect
Southern Hybridization Method -Extracted DNA from evidence is compared to DNA extracted from reference samples -Electrophoresis -Negatively charged DNAs migrate towards the positive electrode -Smaller DNA fragments move faster -Transferred to a nylon membrane (like paper) -A single locus probe is a DNA or RNA sequence that is able to hybridize with DNA from a specific restriction fragmentation -Single locus probes are usually tagged with a radioactive label for easy detection
We can extract DNA from almost everything Blood Hair Semen Saliva Skin We call this evidence “trace evidence” “May” be enough evidence to put someone away (Ex. taxi)
Murder at Rodman Dam, 1988 In July 1987, Randall Scott Jones and Chris Reesh were target shooting (with.3-30 rifles) Truck got stuck in a sandpit Found a couple sleeping in their truck, Matthew Brock and Kelly Lynn Perry They ended up driving away with both trucks What happened?
Bodies were found in a nearby forest (both shot) Kelly appeared to have been sexually abused Warrant was issued by court Confessed as soon as the DNA results were announced
DNA Databases First Type: Known DNA Second Type: Unknown DNA
Conclusion Using DNA in forensic criminology has helped the justice system greatly Has sent/taken people to/from prison DNA lasts forever We can improve on the time it takes to analyze DNA
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